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<title>DY</title>

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<h2>DY</h2>

<p>Size
  of the vertical scrollbar's thumbnail in any unit.</p>

<h3>Value</h3>

<p>Any
  floating-point value greater than zero and smaller than the difference between
  <a
  href="iup_ymax.html">YMAX</a> and <a href="iup_ymin.html">YMIN</a>.</p>
<p>Default:: &quot;0.1&quot;.</p>

<h3>Notes</h3>

<p>LINEY, YMAX and YMIN are only updated in the scrollbar when DY is updated.</p>

<p>When the canvas is visible, a change in DY can generate a redraw in the 
horizontal scrollbar on the screen.</p>

<p>A
  change in these values can affect the attribute <a href="iup_posy.html">POSY</a>.</p>

<h3>Affects</h3>

<p><a href="../elem/iupcanvas.html">IupCanvas</a></p>

<h3>See Also</h3>

<p><a href="iup_scrollbar.html">SCROLLBAR</a></p>
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